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多色矢量高斯-谢尔模型光束的焦移和焦开关 总被引:7,自引:7,他引:0
从交叉谱密度矩阵的传输公式出发,对多色矢量高斯-谢尔模型(GSM)光束的焦移和焦开关作了详细的研究.插入偏振片之前,多色矢量高斯-谢尔模型(GSM)光束通过硬边光阑透镜分离光学系统后,有焦移,但无焦开关;而插入偏振片之后,会出现焦开关.改变偏振片的旋转角度可以控制焦开关的特性. 相似文献
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推导出多色高斯光束和高斯-谢尔模型光束通过杨氏实验双缝传输的谱强度公式.对完全空间相干光和部分空间相干光照明杨氏实验装置出现的光谱开关作了详细研究,并判断其是否属于奇点光学效应. 结果表明:多色场奇点光学效应的判据应当是光谱开关出现时的谱强度极小值Smin=0,而不是总光强极小值Imin=0. 当用多色高斯-谢尔模型光束照明杨氏实验装置时,在近场和远场产生的光谱开关都不属于奇点光学效应. 当用多色高斯光束照明杨氏实验装置时,只有远场产
关键词:
光谱开关
奇点光学效应
完全相干和部分相干
多色光场 相似文献
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The influence of nonparaxiality on the spectral behavior in Young's experiment illuminated by partially coherent light 下载免费PDF全文
Starting from the Rayleigh--Sommerfeld diffraction integral, this
paper studies the spectral behavior in Young's experiment
illuminated by nonparaxial partially coherent light and compares
with the paraxial case, where the influence of nonparaxiality of
partially coherent light on the spectral shifts and spectral
switches is stressed. It is shown that there is a spectral shift in
the nonparaxial case relative to the paraxial one and the critical
position changes, at which the spectral switch occurs. The ratio of
the waist width to the central wavelength w0/λ0 and
relative spatial correlation length \De affect the spectral
difference. The smaller w0/λ0 is, the larger the
difference between the nonparaxial and paraxial results appears. The
effect of relative spatial correlation length Δ is relatively
small. 相似文献
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A detailed study of the spectrum of partially coherent beams diffracted at an astigmatic aperture lens is performed. Considerable attention is paid to the effect of astigmatism on spectral switches of polychromatic Gaussian Schell-model beams. It is shown that the spectral switch can also take place in the vicinity of intensity minimum in a geometrical focal plane for the astigmatic case, but the astigmatism of the lens and the spatial correlation of the beam affect the critical position u_c, spectral minimum S_{min}, and transition height Δ of spectral switches. 相似文献
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激光在湍流大气中的传输有重要的理论研究和实际应用意义.以高斯-谢尔模型(GSM)光束作为部分空间相干光的典型例,基于非Kolmogorov谱和广义惠更斯-菲涅耳原理, 推导出GSM光束在非Kolmogorov湍流中的有效曲率半径的解析表达式. 重点研究了湍流参数(包括广义指数α,内尺度l0,和外尺度L0) 和传输距离z分别对GSM光束有效曲率半径的影响.结果表明, 有效曲率半径Rx(z)随α和z增加先减小然后再增大, 随L0的减小而增大(3.6<α< 4),随l0的增加而增大.并对结果做了物理解释. 相似文献
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